Tran Quoc, B., 		Xuan, P., 		Tuan, P., 		Thuy, L., 		Linh, N., & 		Huy, M.
(2017).
 Calculating real surface area of land parcels in hilly and mountainous regions.
<em>VNU Journal Of Science: Earth And Environmental Sciences, 33</em>(4).
doi:10.25073/2588-1094/vnuees.4196